[rules-users] LHS Conditional Syntax for drl - date comparisonwith objects

[Costello, Robert]

Wonderful!  Thanks very much for your learned response.  Java syntax,
then, is more reserved for the right hand side of the rule, which makes
sense, else we would see semi-colons in the LHS.  

 

Thanks again!

 

Robert Costello

Lead Systems Engineer

IMA Performance

E3- 279A

847.286.0910

 

 

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Scott Reed
Sent: Monday, July 14, 2008 10:02 AM
To: Rules Users List
Subject: Re: [rules-users] LHS Conditional Syntax for drl - date
comparisonwith objects

 

Oops, try this:

rule "Your First Rule"

    

      when 

          Date1( $end1: endDate ) 

          Date2( beginDate > $end1 )

      then 

            #actions

            System.out.println("do something");

end


Scott Reed wrote: 

Try this:

rule "Your First Rule"

    

      when 

      $d1 : Date1( $end1: endDate )     

      $d2 : Date2()

      $d2 : Date2( beginDate > $end1 )

      then 

            #actions

            System.out.println("do something");

end



Costello, Robert wrote: 

I'm having a hard time understanding the syntax in the conditional or
left hand side of the DRL.  Is it acceptable to use dot notation in the
LHS?  Is there a better way to compare fields on different objects? 

 

In the example below, I get an error "Unable to find class $d1.  What
limitations are there syntactically on the left hand side?  Any help
would be greatly appreciated.  I have looked at all the examples and
have googled the problem and don't seem to find the answer.

 

package com.rules

 

#list any import classes here.

import com.validate.Date1

import com.validate.Date2

import java.util.Date

 

#declare any global variables here

 

rule "Your First Rule"

    

      when 

      $d1 : Date1()     

      $d2 : Date2()

      $d2 : Date2(beginDate > $d1.getEndDate)

      then 

            #actions

            System.out.println("do something");

end

 

Best regards,

 

Robert Costello

 




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